Bead for pneumatic tires.



H. K. RAYMOND BEAD FOR PNEUMATIC TIRES. APPLICATLON FILED JUNE 12. I912.

Paienteii May 23, 1916.

10, proved head for penumatic tires.

15. are wound under tension. -'It is highly do @201turnsof the wire may be in proper condir loosened, someportions thereof will be more I 30 would besubjected to the greater strain, and

of thisfioharacteit composed of Wire under I ment isirregular an d some of the coiivolui If: @WFEQE" I HARRYIK. RAYMOND, OF AKRON, OHIO, ASSIGNOR- TO THE B. F GOODRIOH GO'MFANY,

F AKRON, OHIO, A CORPORATION OF OHIO.

enan non PNEUMATIC Trans.

Specification of Letters Patent.

1,184,691. Patented May as, rare.

Original: application filed January 12, 1911, Serial No. 602,248. Divided and this application filed June, 12,

1912. Serial No. 703,189.

bead is wound in its desired position under tension, and is so constructed and treated that the various convolutions of the wire or cable more securely maintain their positions in, and adhere'anore firmly to the finished article, with the result thataa highly ellicient bead is produced. Said bead and the apparatus which may be used in. construct ing'the same are illustrated in the accompanying drawings, wherein: The bead or bead-core hereinafter -de y, Figure 1 is a perspective View, portions be; scribed isxcomposed in part of rubber and'is ing broken away, of the textilercovered wire To all whom itmay concern:

* Be it knownthat ll, HARRY K. RAYMOND, a. citizen of the United States, residing at Akron, in the county of Summit and State 5 of Ohio, have invented certain new and useful Improvements in Beads for Pneumatic Tires, of which the following is a specification. i

My: present invention pertains to an iminextensi-ble, by reason of the'iact that the or cable employed in building'up the bead;

E ig, 2 a sectional View of a press or mold, inwhich, the bead-strip iscured; Fig. 3 a sectional view ofthe shoe or casing of a tire, with the bead applied thereto; and Fig. i a perspective view of one of the complete beads. The wire or cable, designated as a whole time vto take up the strain to which thebead y A, which is placed in a number of conis subjected when in use in a tire, for if the v l ti i th h m B, i id d ith a wire be: loosely wound, or should becom textile or equivaleht covering and is shown enlarged in Fig. In said figure, 1 represents the wire or strands ofthe cable,ac' h strand being preferably formed of a series of wires, the main Lstrapd being wound about a central corc or cord, 2. rue textile covering which 1]: prefer "to use is formed by braiding, thusstorming a covering 3,-.' said covering; iiittrngloosely around the oable; The coverii" g: is subsequently treated with a; thick ruboerfeement, as indicated at the right-hand portion of Fig. 1,",the, rubbentreate d portion being designatediby; 4t-;.' or the fcable may belrun through a rubber soliition and the textile covering thenput on. or the textile material may be impregnatedwithrubberin other ways. Thecable-tlnis produced is wound under te n sionon suitable support and then placedin an, annular groove formed in the member 59f, a vulcanizing press or mold, said groei/efbeing of such cross-section as may be desired, depending upon the kind and shape of tile in which it is to be'used. 11;" 'e drawings I have shown the head as substantially triangular in cross-section." The; convolutions of the wire or cable thus wound under tension maintainexaotly those convol'utions of wire or 'wire cable employed sirablethat the reinforcing wire should be wound in the bead under tension, and that theconvolutionsshould not thereafter shift a on each other in order that all portions and 25 slakthan others, and the head will not only be somewhat extensible, but willbe weakenedbyreason of the fact that notall of the wirev will, atqthe same time, be acting to resist the strain,- but the tighter portion if ,thoseportionsdo not break but stretch so as to bring. strain on the looser portions also, themovementofthe parts further weakens an'd; soon-destroys the bead. -A-proininentwdiiiiculty in making beads tension ina body of rubber, arises from the factifith at, when therubber becomes heatedii and consequently; soft" in the process of vul- "canization, the Wire cuts through the rub ber,,orthe rubber flows by the Wire, with theresult that the wire moves from the positions which it was, intended and. designed to occupy in the bead. --Further, such move;

tions of wire or piirtions thereof, b'ecome' slacker than others, when objectionable, as above explained: g In the production of improved head 50 the wire or cable which give t eir t the the process of vulcanization, and this is tile sheathing or casing which casing ma-in' tains the convolutions in their proper 'position during the process of vulcanization.

Said casing or sheathing likewise has the effect of preventing the softened rubber from shifting its position, during vulcanization, or of preventing the wirefrom shifting its position-in the softened rubber. -Furthermore, the presence of the rubber and textile material reduces the amount of wire required to give the bead-core a certain size, and contributes something to its strength. After the bead has been built up to the requisite size and placed in the groove of the mold, the top of 6 of the mold or press is put in position and the whole subjectedto heat sufficient to secure the degree \of vulcanization desired. The -bead-core is then removed from the mold and. built into the tire in the usual way, as indicated in Fig. 3. This view represents a well-known type of pneumatic tire casing known as the straightside type, in which the bead-core is located between the lower margins ofqthe inner and outer fabric layers of the carcass. It is found that a core of this-improved'construction, by-reason of the rubberized fabric covering of the wire cable, has a better adhesion to the carcass layers than one made with a bare wire embedded in rubber, and reduces the tendency of the two parts of the carcass to separate at the upper corner of the bead, which is a common fault in most tires employing inextensible beads. It has been found by actual use that the con'volutions. maintain their positions during brought about by the employment of the casing 3, or its equivalent, which prevents the parts from shifting when the winding or the vulcanization is being eflected or when the tire is in use.

' The rubber applied to the cable casing is usually sufiici'ent in quantity to completely fill the ifnold, but ifnece'ssary an additional 7 amount may be.'applied previously to the closing of the mol In practice it may be found desirable-to apply a sheet of fabric to one'or more sides of the bead thus produced, but this is not of the essence of the invention and is not shown herein.

-By. forming the bead in'the above-descnibedmanner the various convolutions of the cable will be 'free'from kinks, or slack "-"tendency for the parts to bulge or break out,"nor, while the bead isbeing formed,

portions, or the like, and there will be no of the convolutions to shift their position and thereby cause a weakening of the head in the manner hereinbefore described.

' position.

Inasmuch as the head is continuous, and

destruction of the bead, it is essentialto the production of a uniform product that a process be employed which will admit of the parts being properly positioned in the first place and thereafter, during the remainder of the process, maintained in such This case is a division of my application Serial No. 602,248, filed January 12, 1911,

forflthe process of forming a bead of the described character.

Having thus gdescribed my invention, what I claim is: v

1. As 'a new article of manufacture, an

annular bead for-tires, composed of a wire cable inclosed in a rubberized textile sheath and wound in a plurality of adhering convolutions which are maii'itained. in fixed 're lation by the rubber and textile material.

'2. As a new article of manufacture, an annular bead for tires, composed of a wire cable incl'osed in a. rubberized tube of braided fabric'and wound in a plurality of adherent convolutions.

The combination ofv a laminated tire carcass, and a bead located between and enwrapped by the'layers of said carcass and composed of a plurality of convolutions of wire, substantially inextensible under stress eachinclosed in a textile" covering and embedded in rubber.

4. The combination. of a laminated tire carcass, and a bead of substantiallytriangular cross-section located between and enwrapped by the layers of said carcass and composed of aplurality of rubber-embedded.

convolutions of substantially inextensible wire cable ing, r

5. As a new article of manufacture, a bead for tires, comprising arrannular member, the body (If which is composed of a cable surrounded by a body of rubber, said cable being composed of a wire member having a fibrous sheathing thereon and being substantially inextensible under stress.

6, As a new article of manufacture, an annular bead for tires, composed of a cable member embedded in rubber, said cable member comprising a plurality of convolutions and formed of wire siirrounded by a fibrous rubberized sheathing,

7. As a new article of manufacture, an

provided with a textile sheath-.

said convolutlons belng substantially inextensible.

annular head for tires comprising, in com-- bina'tion,, a cable wound in a plurality of convolutions, said cable being embedded in rubberand' formed of a plurality of wire strands with a" braided, textile, rubberized sheathing placed thereon, said cable, and

consequently the 'convolutions, being substantially inextensible under stress.

8. As a new article of manufacture, a head for tires, comprising a wire cable having a rubberized fabric sheath thereon, said cable being Wound in a plurality of convolutions which contact with each other; and a body of rubber covering said convolutions and filling the spaces between the same.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

HARRY K. RAYMOND.

Witnesses:

\ CLARENCE S. GREENLESE,

VVALTER K. MEANS. 

